WORK IN PROGRESS: The German polarity lexicon contains only uninflected
forms and there are no subjectivity scores yet. As of version 0.2.3, lemmatized
word forms are submitted to the PatternAnalyzer, increasing the accuracy
of polarity values. New in version 0.2.7: return type of .sentiment is now
adapted to the main TextBlob library (:rtype: namedtuple).

Access to pattern API in Python3

Alternatively, the path to textblob_de/ext can be added to the PYTHONPATH, which allows
the use of pattern.de in almost the same way as described in its
Documentation.
The only difference is that you will have to prepend an underscore:
from _pattern.de import .... This is a precautionary measure in case the pattern
library gets native Python3 support in the future.